Magnetic ordering in the ammoniated fulleride (ND{sub 3})K{sub 3}C{sub 60}
Intercalation of C{sub 60} with alkali metals leads to superconducting compositions A{sub 3}C{sub 60} (A = alkali metal) with critical temperatures as high as 33 K, surpassed only by the high-{Tc} superconducting cuprates. It is well established that {Tc} increases monotonically with increasing interfullerene separation, d, as the density of states at the Fermi level, N({epsilon}{sub F}) increases. Of paramount importance is the search for new materials with larger lattice parameters in order to establish whether {Tc} can be driven to higher values or the anticipated band narrowing will lead to electron localization and a transition to a Mott insulator. Ammoniation has proven an excellent method to achieve large expansions of the fulleride unit cells, as neutral NH{sub 3} molecules coordinate to the alkali ions, leading to large effective radii for the (NH{sub 3}){sub x}A{sup +} species.
- Research Organization:
- Univ. of Sussex, Brighton (GB)
- Sponsoring Organization:
- New Energy and Industrial Technology Development Organization; British Council; Japanese Ministry of Education, Science, Sports, and Culture; Society for the Promotion of Science
- OSTI ID:
- 20014101
- Journal Information:
- Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 48 Vol. 121; ISSN JACSAT; ISSN 0002-7863
- Country of Publication:
- United States
- Language:
- English
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